PF X4-400, Installation And Operation Manual

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7.7 Install stack thermometer and Flue Gas Analyzer sample line into breeching and connect the draft gauge
to combustion chamber test point.
7.8 Connect a microammeter to the Primary Safety Control as directed in the PSG control manufacturer’s
instruction bulletin to determine flame detection system values. The meter is normally connected in
series with the (SENSE) terminal on the S8600 or S89F series control.
7.9 With the main and leak test cocks and pilot cock in OFF position, turn on the gas cock at meter. Check to
make certain that pressure upstream of main and pilot cocks does not exceed 14” w.c. (1/2 PSIG) –
unless special valve train components suitably rated have been furnished (Refer to Burner Specification
Sheet). If pressure is acceptable, proceed to next step.
7.10 Pilot Ignition
Next check the operation of the gas pilot system. This is a very important part of the start up
procedure.
A. Before attempting burner start up make certain that you are familiar with the operation of the
Primary Safety Control and other components being used on this specific application. Refer to
Fig. 6 and 6A.
B. To prepare the pilot for proper operation, it is essential that appropriate adjustments be made to
the burner air inlet damper and the pilot gas pressure. See Table 3 for the approximate air
damper setting at the various firing rates. Typical pilot test pressures are 3” to 4” w.c. for natural
and propane gas. Normally, lower pressures are required for air damper openings of 50% or
less.
Figure 6 Pilot/Gun Assembly – Flame Rod Type – Natural Gas/LP Gas
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